.logincshtml_background{
    width: 100%;
    height: 100%;
    background: url("https://cdn.ywart.com/material/mainsite/login/loginbg5.jpg") no-repeat;
    background-position: center center;
    background-size: cover;
    position: fixed;
    z-index: 1; 
    top: 0;  
    left: 0;
}
.page_login{
        position: fixed;
        width: 100%;
        height: 100%;
        z-index: 100;
        top: 0;
        left: 0;
        background: rgba(0,0,0,0.5);
        .page_login_box{
            position: absolute;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            width: 360px;
            height: 600px;
            margin: auto;
            font-size: 14px;
            .logo{
                width: 100%;
                height: 170px;
                position: relative;
                img{
                    left: 0;
                    right: 0;
                    position: absolute;
                    width: 80%;
                    margin: auto;
                }
            }
            .page_login_dialog{
                background: #FFF;
                height: 393px;
                text-align: center;
                padding: 60px 30px 30px 30px;
                position: relative;
                .closelogin{
                    position: absolute;
                    width: 20px;
                    height: 20px;
                    top: 5px;
                    right: 5px;
                }
                #tishi,#alert_tip{
                    width: 100px;
                    height: 30px;
                    position: absolute;
                    top: 50px;
                    left: 100px;
                    // right: 0;
                    
                }
            }
        }
}